US Democratic Senator Elizabeth Warren has announced that she is establishing an exploratory committee to consider a presidential run in 2020.

The move, the first by a high-profile Democrat for 2020, allows Ms Warren, 69, to ramp up her fundraising.

In October, Ms Warren revealed the results of a DNA test she said proved her Native American heritage after she was taunted by President Donald Trump. It immediately sparked speculation that she would run for the presidency.